Shareholders Equity - Summary of Changes in Shareholders Equity (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stockholders Equity Note [Line Items]
Tax provision (benefit) for recognized net actuarial loss (gain)	$ (28)	$ (35)
Unrecognized Pension Benefit Cost [Member]
Stockholders Equity Note [Line Items]
Tax provision (benefit) for recognized net actuarial loss (gain)	$ 28	$ 35
Treasury Stock [Member]
Stockholders Equity Note [Line Items]
Purchase of common shares	29,436	52,590
Common Shares [Member]
Stockholders Equity Note [Line Items]
Issuance of common shares	62,387	63,316
Common Shares Issued to Rabbi Trust [Member]
Stockholders Equity Note [Line Items]
Common shares distributed from rabbi trust		3,727
Common shares issued to rabbi trust	12,752
Deferred Compensation Liability [Member]
Stockholders Equity Note [Line Items]
Common shares distributed from rabbi trust		3,727
Common shares issued to rabbi trust	12,752
Retained Earnings [Member]
Stockholders Equity Note [Line Items]
Cash dividends declared per share	$ 20	$ 20